RU2686967C2 - Accessory gearbox (versions) and gas turbine engine - Google Patents

Abstract

FIELD: engines and pumps.SUBSTANCE: accessory gearbox of gas turbine engine for rotation of the device connected to gas turbine engine comprises crankcase, motion selection element and at least one kinematic chain. Motion selection element is made with possibility of engagement with radial shaft of gas turbine engine. Kinematic chain is located inside the crankcase, it is made with possibility to transfer rotation from the motion selection element to the device shaft and has the first end and the second end. Motion selection organ is connected with kinematic chain via gear transmission with intersecting axes located between first and second ends of kinematic chain. Said kinematic chain comprises central shaft to transfer motion from motion selection organ to device rotary shaft via intermediate gearing. Central shaft has two ends. Motion selection organ is connected to the central shaft via a gear train with intersecting axles located between the first and second ends of the central shaft. Central shaft comprises first and second parts, wherein motion selection element is connected to first part via first gear with intersecting axes and second part via second gearing with intersecting axes. In another version, the accessory gearbox comprises two kinematic chains, each of which is configured to transmit the rotation motion from the motion selection element to the device rotating shaft and comprises first and second ends. Motion selection element is connected to each kinematic chain via a gear train with intersecting axes located between the first and the second ends of each kinematic chain. One more invention relates to gas turbine engine containing above described accessory box.EFFECT: group of inventions makes it possible to change the position of the motion selection element relative to the accessory gearbox.8 cl, 4 dwg

Description

TECHNICAL FIELD

The present invention relates to a drive unit box for a gas turbine engine, also called an AGB from an “accessory gear box”. Such an aggregate drive box is designed to transmit the initial motion of a gas turbine engine through a radial shaft coming out of it to various units or devices associated with a gas turbine engine, such as pumps, electric generators, etc., which are necessary for the operation of the gas turbine engine, or to others aircraft instruments powered by this gas turbine engine. The unit drive box also allows power to be transferred from the devices to the engine during start-up phases. Transmission occurs through a kinematic chain consisting of sequential gears.

PRIOR ART

A known box of drive units mounted on a gas turbine engine, to bring into rotation at least one device associated with a gas turbine engine. This box drives the units of the body of the selection of motion, designed to engage with the radial shaft of the gas turbine engine crankcase; two kinematic chains inside the crankcase. Each kinematic chain consists of interconnected gears. Each gear allows rotating the rotating shaft of the device. Both kinematic chains are in non-parallel planes. The organ of motion selection is connected with each kinematic chain at the level of one of the ends of the mentioned kinematic chain.

Also known is another type of box drive units, mounted on a gas turbine engine, to bring into rotation at least one device associated with a gas turbine engine. This unit drive box contains:

- the body of the selection of movement, designed to engage with the radial shaft of the gas turbine engine,

- Carter,

- Kinematic chain inside the crankcase. The kinematic chain contains a central shaft, which transmits the movement from the body of the selection movement to at least one gear, made with the possibility of bringing into rotation at least one rotating shaft of the device. The power take-off is connected to the central shaft at the level of one of the ends of the central shaft.

However, in these two documents, motion selection is a problem and cannot be performed on all shafts of a gas turbine engine.

SUMMARY OF INVENTION

The invention aims to eliminate the drawbacks of the known technical solutions and propose an aggregate drive box for mounting on a gas turbine engine for driving at least one device associated with a gas turbine engine, which has a wider range for implementing motion selection, allowing, in particular, motion selection on the high-pressure shaft of a gas turbine engine, on its low-pressure shaft or on its intermediate shaft.

To do this, proposed as the first object of the invention is the unit drive box designed for mounting on a gas turbine engine, called “Linear box drive units” to bring into rotation at least one device associated with a gas turbine engine according to paragraph 1 of the formula.

Thus, in the invention it is proposed to link the organ of motion selection with the kinematic chain not at the level of the end of the kinematic chain, but at the level of a point located strictly between the two ends of the kinematic chain. Placing the body inside the kinematic chain allows you to get a greater range for the implementation of the selection of motion on the shaft and, therefore, more opportunities for installing the box of drive units. In particular, movement can be selected not in the crankcase area between compressors, but in a place other than drive shafts, for example, on an intermediate shaft or between a turbine or a combustion chamber, or between a compressor and a turbine.

Thus, the movement from the organ of the selection movement is transmitted to the rotating shaft of the device through the central shaft, which gives a gain in space and greater freedom in the arrangement of the drive box of the units.

Preferably, the movement selection organ is located in a direction that is in the direction of the central shaft.

The displacement of the movement selection organ allows in this case to divide the central shaft into two parts, which are connected independently of each other with the central shaft.

Preferably, the first gear with intersecting axles preferably has a lower gear ratio other than the lower gear ratio of the second gear with intersecting axes, therefore the two parts of the central shaft can rotate at different speeds. Thus, it is possible to connect slow devices with one of two parts of the central shaft, while fast devices can be connected with another part of the central shaft, which allows optimization of the kinematic chain.

According to the second aspect, the invention has as its object a box of drive units for fixing on a gas turbine engine referred to as a “V-box of drive units” for driving at least one equipment mounted on a gas turbine engine in accordance with paragraph 3 of the formula. Preferably, each kinematic chain contains a line of gears, with two lines of gears located in secant directions.

According to various embodiments, both gears with intersecting axles may have different or the same reduction gear ratios.

The third aspect of the invention is a gas turbine engine comprising a box of drive assemblies of the invention.

According to various embodiments:

- the gas turbine engine contains a high-pressure shaft, while the movement selection organ is connected to the high-pressure shaft;

- the gas turbine engine contains a low-pressure shaft, while the movement selection organ is connected to the low-pressure shaft;

- gas turbine engine contains an intermediate shaft, while the organ of the selection of motion is connected with the intermediate shaft.

BRIEF DESCRIPTION OF FIGURES

Other features and advantages of the invention will be more apparent from the following detailed description with reference to the accompanying figures, in which:

FIG. 1 shows a schematic isometric view of a known unit drive box.

FIG. 2 shows a schematic view in isometric of the drive box of the aggregates according to the first embodiment of the invention.

FIG. 3 is a schematic isometric view of the drive box of the aggregates according to the second embodiment of the invention.

FIG. 4 is a schematic isometric view of an assembly drive box according to another embodiment of the invention.

For clarity, identical or similar elements in all figures are denoted by the same positions.

DETAILED DESCRIPTION AT LESS THAN ONE PERFORMANCE OPTION

FIG. 2 shows an assembly drive box according to an embodiment of the invention called an “V-drive assembly box”. This unit drive box contains:

- crankcase 44;

- organ 1 selection of motion;

- the first and second kinematic chains 2,3. Each kinematic chain 2,3 contains an intermediate gear line 22,23. Each intermediate gear 22,23 is preferably configured to cause the rotation of the rotating shaft of the device. Each kinematic chain 2.3 contains a first end 4.5 and a second end 6.7.

In contrast to the known drive boxes of aggregates, in which the movement selection body 1 is associated with each kinematic chain at the level of one of its ends, in this embodiment the movement selection body 1 is associated with each kinematic chain 2.3 at the zone 14 level inside this kinematic chain. In other words, zone 14 is strictly between the two ends of 4.6 and 6.7 of each kinematic chain 2,3. In particular, it is preferable that the movement selection body 1 is associated with each kinematic chain at the level of one of its intermediate gears 22,23, which is located between two intermediate gears of the kinematic chain. The location of the movement selection organ 1 can thus be selected depending on the radial shaft of the gas turbine engine with which it is associated.

Preferably, the movement selection body 1 is connected to each kinematic chain through a gear train 24 with intersecting axes. According to an embodiment, the gear train 24 with intersecting axes connecting the movement selection body 1 to the first kinematic chain 2 can have a reduction ratio other than the gear reduction ratio connecting the movement selection body 1 to the second kinematic chain 3. Thus slow devices can be connected to one of two kinematic chains, while fast devices can be connected to another.

FIG. 3 shows an assembly drive box in accordance with another embodiment, referred to as the “linear drive assembly box”.

In this embodiment, the unit drive box contains:

- crankcase 25;

- organ 1 selection of motion;

- kinematic chain 8.

The kinematic chain 8 contains a central shaft 10 associated with intermediate gears 9, with each intermediate gear 9, in turn, connected with the rotating shaft 11 of the device. The central shaft has two ends 12,13. The Central shaft 10 is connected with the body 1 of the selection of the movement through the gear 26 with intersecting axes. Thus, the movement selection body 1 transmits its rotational movement to the rotating shafts 11 via intermediate gears 9. According to an embodiment, it is also possible to use the same gear transmission to carry out the movement selection and its transfer to the gears of the devices. In this case, the gear train 26 with intersecting axles and the intermediate gear train 9 are the same gear train.

The unit drive box according to this embodiment is characterized in that the movement selection organ 1 is not connected with the end 12 of the central shaft 10, as in the known embodiments, but is connected with the central shaft 10 at the zone level between the two ends 12,13 of the central shaft. In particular, the movement selection organ 1 is preferably connected to the central shaft 10 at the level of zone 14, which is located between two intermediate gears 9.

As shown in FIG. 4, the central shaft 10 may also consist of two parts 15, 16, connected independently of each other to a movement selection body 1, the first part 15 of the central shaft 10 being connected to the movement selection body 1 via a first gear train 27 with intersecting axes, and the second part 16 of the central shaft 10 is connected to the movement selection body 1 via the second gear 28 with intersecting axes. Preferably both parts 15,16 are located in a line. The first gear 27 with intersecting axles may have a reduction ratio, different from the reduction ratio of the second gear 28 with intersecting axes, therefore the first part 15 of the central shaft 10 rotates at a speed different from the speed of the second part 16. Thus, you can combine slow devices with one of two parts 15,16, while fast devices connect with another part.

Naturally, the invention is not limited to the embodiments described with reference to the figures, and versions thereof can be provided without departing from the scope of the invention.

Claims (19)

1. A unit drive box designed for mounting on a gas turbine engine to drive at least one device associated with a gas turbine engine, while the unit drive box contains: - Carter; - body (1) of the selection of movement, made with the possibility of engagement with the radial shaft of the gas turbine engine; - at least one kinematic chain (2, 3, 8) inside the crankcase, made with the possibility of transmitting the rotational movement from the body (1) of the movement to at least one rotating shaft of the device, while the kinematic chain (2, 3, 8) has a first end (4, 5, 12) and a second end (6,7,13), characterized in that the movement selection organ (1) is connected with the kinematic chain (2, 3, 8) through a gear with intersecting axes located between the first end (4, 5, 12) and the second end (6, 7, 13) of the kinematic chains (2, 3, 8), moreover, in the drive box of the aggregates, the kinematic chain (8) contains at least one central shaft (10), made with the possibility of transmitting motion from the movement selection organ (1) to at least one rotating shaft (11) of the device through at least one intermediate gear (9), while the central shaft (10) has two ends (12, 13), while the movement selection organ (1) is connected to the central shaft (10) through a gear with intersecting axes located between the first end (12 ) and the second end (13) of the central shaft (10), moreover, the central shaft (10) contains the first (15) and second (16) parts, while the movement selection body (1) is connected with the first part (15) through the first gear with intersecting axes and with the second part (16) through the second gear transmission with intersecting axes. 2. A drive box of assemblies according to claim 1, in which the first gear transmission with intersecting axles has a reduction gear ratio other than the reduction gear ratio of the second gear transmission with intersecting axes. 3. A unit drive box designed for mounting on a gas turbine engine to drive at least one device associated with a gas turbine engine, while the unit drive box contains: - Carter; - body (1) of the selection of movement, made with the possibility of engagement with the radial shaft of the gas turbine engine; - at least one kinematic chain (2, 3, 8) inside the crankcase, made with the possibility of transmitting the rotational movement from the body (1) of the movement to at least one rotating shaft of the device, while the kinematic chain (2, 3, 8) has a first end (4, 5, 12) and a second end (6, 7, 13), characterized in that the movement selection organ (1) is connected with the kinematic chain (2, 3, 8) through a gear with intersecting axes located between the first end (4, 5, 12) and the second end (6, 7, 13) of the kinematic chains (2, 3, 8), moreover, said gearbox of aggregates contains two kinematic chains (2, 3), with each kinematic chain (2, 3) configured to transmit a rotational movement from the body (1) of the movement to at least one rotating shaft of the device, each the kinematic chain (2, 3) contains the first end (4, 5) and the second end (6, 7), and the movement selection organ (1) is connected to each kinematic chain (2, 3) through a gear with intersecting axes located between the first (4, 5) and second (6, 7) ends of each kinematic chain and (2,3). 4. A box of aggregate drives according to claim 3, in which both gears with intersecting axes have different reduction gear ratios. 5. Gas turbine engine containing a box of drive units according to one of claims 1 to 4. 6. The gas turbine engine according to claim 5, in which the gas turbine engine comprises a high-pressure shaft, wherein the movement selection member is connected to the high-pressure shaft. 7. The gas turbine engine according to claim 5, further comprising a low pressure shaft, wherein the movement selection member is connected to the low pressure shaft. 8. The gas turbine engine according to claim 5, further comprising an intermediate shaft, wherein the movement selection organ is associated with the intermediate shaft.

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